JavaFX Application create car racing animation

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.ContentDisplay;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Polyline;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Main extends Application {

   @Override//from  w w w.  j  ava  2 s  .  c  o  m
   public void start(Stage primaryStage) throws Exception {

      HBox hBoxTFRates = new HBox();
      hBoxTFRates.setSpacing(10);
      hBoxTFRates.setAlignment(Pos.CENTER);

      VBox vBox = new VBox(hBoxTFRates);

      Timeline[] timelines = new Timeline[4];

      TextField[] tfCarRate = new TextField[4];

      for (int i = 0; i < timelines.length; i++) {

         // Car pane
         CarPane carPane = new CarPane(900, 100);
         timelines[i] = new Timeline(new KeyFrame(Duration.millis(10), e -> carPane.moveCar(1)));
         timelines[i].setCycleCount(carPane.getOneCycleDuration());
         timelines[i].play();

         carPane.setStyle("-fx-border-color: black;" + "-fx-border-insets: 5px");
         vBox.getChildren().add(carPane);

         // Top pane
         tfCarRate[i] = new TextField();
         tfCarRate[i].setPrefColumnCount(3);
         tfCarRate[i].setText(timelines[i].getCurrentRate() + "");
         Label lblCarRates = new Label("Car " + (i + 1) + ":", tfCarRate[i]);
         lblCarRates.setContentDisplay(ContentDisplay.RIGHT);
         hBoxTFRates.getChildren().add(lblCarRates);

         // listeners
         final int index = i;
         timelines[i].setOnFinished(e -> {
            carPane.reset();
            timelines[index].play();
         });

         tfCarRate[i].setOnAction(e -> {

            tfCarRate[index].setText(Math.min(Double.parseDouble(tfCarRate[index].getText()), 100) + "");
            timelines[index].setRate(Double.parseDouble(tfCarRate[index].getText()));

         });
         tfCarRate[i].setFocusTraversable(false);
      }

      primaryStage.setScene(new Scene(vBox));
      primaryStage.setTitle("Moving Car");
      primaryStage.show();
   }

   public static void main(String[] args) {
      Application.launch(args);
   }
}

class CarPane extends Pane {
   private double w; // pane width
   private double h; // pane height

   // left Tire x,y and radius
   private double leftTireX; // left tire is the car's drawing start point
   private double leftTireY;
   private double tireRadius;

   Circle[] tires = new Circle[2]; // Index 0, 1 = left and right tire
   Polyline cover = new Polyline();
   ObservableList<Double> points;
   Rectangle base;

   CarPane(double width, double height) {
      // Get width height and measurements for the left tire (starting point)
      w = width;
      h = height;
      leftTireX = w * 0.2;
      leftTireY = h * 0.9;
      tireRadius = h * 0.1;

      // set MIN and MAX width
      setMinWidth(w);
      setMinHeight(h);

      setMaxWidth(w);
      setMaxHeight(h);

      reset(); // draws and adjusts car to starting position
   }

   public void reset() {
      if (points != null)
         points.clear();
      getChildren().clear();
      drawCar();
      moveCar(tireRadius * 13 * -1);
   }

   public void drawCar() {
      for (int i = 0; i < tires.length; i++) {
         tires[i] = new Circle(leftTireX + (i * 4 * tireRadius), leftTireY, tireRadius);
         tires[i].setStroke(Color.BLACK);
         tires[i].setFill(Color.TRANSPARENT);
      }

      double baseX = tires[0].getCenterX() - tires[0].getRadius() * 3;
      double baseY = tires[0].getCenterY() - tires[0].getRadius() * 3;
      base = new Rectangle(baseX, baseY, tireRadius * 10, tireRadius * 2);
      base.setFill(Color.TRANSPARENT);
      base.setStroke(Color.BLACK);

      // draw the car's top cover
      double startX = base.getX() + tireRadius * 2;
      double startY = base.getY();
      double currentX = startX;
      double currentY = startY;

      points = cover.getPoints();

      double distance = tireRadius * 2;
      points.addAll(currentX, currentY); // start point

      currentX += distance;
      currentY -= distance;
      points.addAll(currentX, currentY); // up right

      currentX += distance;
      points.addAll(currentX, currentY); // right

      currentX += distance;
      currentY += distance;
      points.addAll(currentX, currentY); // down right

      points.addAll(startX, startY); // connect to starting point
      cover.setFill(Color.BLUE);

      getChildren().addAll(tires);
      getChildren().add(base);
      getChildren().add(cover);
   }

   void moveCar(double distance) {
      for (Circle c : tires) {
         c.setCenterX(c.getCenterX() + distance);
      }
      base.setX(base.getX() + distance);

      for (int i = 0; i < points.size(); i += 2) {
         points.set(i, points.get(i) + distance);
      }
   }
   public int getOneCycleDuration() {
      return (int) w;
   }
}